Spatio Temporal Blind Identification of Fir Channels for Multiple Users

A new method is proposed for blind identi cation of possibly nonminimumphase FIR channels with multiple users The technique exploits the structure of the signals received by an antenna array in both the temporal and spatial frequency domains Although in the single an tenna case it is necessary to use cyclostationary signals or higher order statistics to identify the magnitude and phase of the channel we circumvent such a requirement by exploiting certain multichannel features of the array We show that if multiple users are present the nonmin imum phase channels associated with each user can still be identi ed from the second order statistics provided additional spatial structure exists